Cleaner for the flue-gas channels of preheaters



April 21, 1931. E. HABER 01,

CLEANER FOR THE FLUE GAS CHANNELS 0F PREHEATERS Filed June 14, 1926 2 She ets-Sheet 1 Fig.1.

In Venlor: J' 1% E. HABER 1,801,811

CLEANER FOR THE FLUE GAS CHANNELS 0F PREHEATERS Apgil 21, 1931.

Filed June 1926 2 Sheets-Sheet 2 P? Q. EEE MR, Q

Patented Apr. 21, I931 NI srAr Aren't res EUGEN HAB ER, F BERLIN-GHARLOTTEIQ'BURG, GERMANY CLEANER FOR rnn rr-nnens CHANNELS on PREHEATERS Application filed June l4,'1926,:Seria1 No.

' heated, fiow in cross current the one on the one and the other on the other surface.

The new apparatus serves for'cleaning the gaschannels during the service and it consists of a distributing element which is mounted on the supply pipe for'stean or compressed air so that it can be shifted-in longitudinal direction and having a-trans- 16 verse tube on its front end carrying the injection nozzles. For cleaning a pre-heater the distributing element is stepwise advanced on the supply pipe for the cleaning medium.

The distributing-element is tightly guided upon the supply pipe by means of a stilling box. The cleaner consumes a minimum quantity of cleaning'medium. The shifting of the distributing element is effected either by hand, with the aid of a rack or pinion gear, or by a motor.

Several embodiments of the invention are shown, by way of example, in the accon panying drawings, in which: I

Fig. 1 shows in top'plan view, partly in section, a cleaner, according to theinvention, inserted into a heat-exchanging element which is shown in horizontal section as built into a fiue-connection'to chimney.

Fig. 2 is a similar view as Fig. 1 showing a modification of the cleaner.

Fig. 3 is an end elevation of Fig. 2 viewed from the right, partly in section.

Fig. 4 shows, on greatly enlarged scale, a section through the distributing tube and one nozzle. v

Fig. 5 shows in side elevation, partly in section, a cleaner built into the masonry of the flue-connection to chimney and operated by motor.

The heat-exchanging element 1 (Fig. 1) is composed of sheet-metal plates 2 which are united in such a manner that in the element channels 3 for the heating medium and for the medium to be heated are formed. The flue gases from a furnace serve as heat- 116,061fand in Germany March 30, 1926.

ing medium, the medium to be heated being air, gas or a liquid. The heat-exchanging element 1 is built into the flue or into the flue-connection 4 to chimney of a boiler plant. Above the heat exchanging element 1 at a tube 5 (Fig. 5) is mounted in the inasonry parallel to the gas channels of the element 1. This tube 5 has at its inner end a transverse tube 6, said tubes 5 and 6 together forming the distributing element of the cleaner. The transverse tube 6 has downwardly directed nozzles 7 designed to inject a cleaning medium, for instance compressed air or steam, into the gas channels?) of the heat-exchanging element 1. If steam is used as cleaning medium, it is preferably taken from the boiler plant.

The outer end of tube 5 is tightly guided by means of a stufling box 8 upon a steam supply pipe 9. Means may be provided to guide the distributing tube 7 in the heat exchanging element. r

For cleaning the fiue-gas'channels 3 of the heat exchanging element 1 steam is admitted into the steam pipe 9. This steam flows through tube 5 into the transverse tube 6 and is injected through the nozzles 7 into the flue gas channels 3 and removes all impurities as soot, flue dust and the like from the walls of said flue-gas channels. One flue-gas channel after the other is thus cleaned by successively advancing the distributing element which is returned to the initial position if all the flue-gas channels have been cleaned.- The steam supply pipe 9 is preferably a flexible pipe-so that the v cleaner can be easily removed and operated.

The cleaner can be operated by hand or mechanically. In the latter case a rack 10 is fixed on the'tube 5, or teethare cut into the upper surface of this tube, a pinion 11 mounted so that itcan freely rotate on an axle l2 fixed-in the saidrack 10 (Figs. 3 and guided overa sprocket wheel 14 rigid with the pinion 11 serves to operate the mecha-V nism from a distance;

. The transverse tube6, carrying the nozzles 7 can be parallel to the flue gas channels 3, as shown in Figs. 2 and 3. The axial dis masonry meshing with A chain 13 placement of the distributing element is effected in a similar manner as described above. In order to reduce the number oi nozzles T, for instance to four nozzles, the distributing element is arranged so that it can be shifted, also in transverse direction. With this object in view the tube 5 is guided in a slot of the masonry and it engages with a hole in a slidable plate 16 which is horizontally guided in frame 17 fixed on the outer surface of the .iasonry.

The transverse tube 6 is fitted with suitable means for centering the nozzles 7 in their working positions above the flue-gas channel 8. for this PUYPOSG a plate 18 or several plates, each of them having a notch 19, is or .re arranged underneath the transverse tube 6 {l 3), d notch or notches adapted to enga e over the edge of a neighbouring air ch .inel in the working position of the cleaning apparatus.

t 'uction oi the nozzles 7 is illustrated in Fg l. Each nozzle 7 is mounted on the transverse tube 6 by means of a threaded tubular end 20. Two spiders 2i, 21 are lixed on the outer surface of each nozzle 7, said spiders being threaded at the outer edge. An outer nozzle-envelope 22 is screwed onto these spiders so that the jet of cleaning medium flowing out or the orifice of nozzle 7 is spread out.

The collars 21, 21 may be of such shape that a circulating movement is communicate l to the flue gases which are sucked into the space between the outer surface of nozzle 7 and the inner surface of envelope 22 so that these gases are intimately mixed with the steam jet the action of the pressure fluid upon the walls of the channels being thus increased.

If the rigid steam pipe 9 is continued by a flexible pipe the distributing element can be easily shifted in transverse directions. If the steam pipe is rigid throughout it must be bent at right angles and connected with a horizontal main pipe 23 by an elbow joint 24 which is connected with pipe 9 and with the main pipe 23 by means of smiling boxes 25 which ensure tight packing but do not impede rotation of the steam pipe.

In the form of construction shown in Fig. 3 the distributing element is advanced in a similar manner as in the form of construc tion shown in Fig l.

The distributing element in the form of construction shown in Fig. 5 has two transverse nozzle tubes 6. More than two such tubes might be provided. The tube 5 is shown in Fig. 5 in its extreme position the collar 26 being flush with the inner end of the hole 27 in the masonry l. An angular plate 28, fixed on the outer surface of the masonry 4 and having an aperture in which the outer end of ube 5 is guided, shuts ofi' said hole 27 at the outer end. The tube 5 is slidably mounted by means of a stufling box upon the steam pipe 9 which has an abutment 29 designed to limit the displacement of tube 5. This tube 5 has teeth 10 on its upper surface with which teeth a pinion 11 meshes, the axle 12 of which is ournaled in bearings fixed on the angular plate 28. On this axle 12 a worm wheel 30 is keyed which meshes with a worm 31 which is rotated by an electromotor 32 suspended from an arm 33 of the angular plate 28. For the motor any other driving engine might be substituted. The compressed fluid for cleaning the flue-gas channels, i. e. steam or compressed air, flows into the supply pipe 9 in the direction of the arrow 34c.

I claim A cleaner for the flue-gas channels of airheaters composed of plates mounted in a flue, the flue-gas serving as a heating medium comprising in combination with a flue having a transverse aperture, a mechanically operated distributing element consisting of a longitudinal tube and of a transverse tube, nozzles in said transverse tube for the distribution of the pressurefluid, an outer-guide-frame in said aperture of the flue, a slide slidably arranged in said guide-frame and having an aperture for guiding said longitudinal tube, means for shifting said slide in its plane, a rigid steamsupply-pipe, a horizontal end-piece on said steam-supply pipe of smaller diameter than said longitudinal tube and adapted to guide the latter, a packing fixed on the inner side of said longitudinal tube adapted to slide tightly on said end-piece of said steam-supply pipe, and a driving gear for producing reciprocating movements of said longitudinal tube.

In testimony whereof I afiix my signature.

EUGEN HABER. 

